EP2150690A1 - Electrically heatable honey-comb structure having zones of increased resistance - Google Patents

Electrically heatable honey-comb structure having zones of increased resistance

Info

Publication number
EP2150690A1
EP2150690A1 EP08759792A EP08759792A EP2150690A1 EP 2150690 A1 EP2150690 A1 EP 2150690A1 EP 08759792 A EP08759792 A EP 08759792A EP 08759792 A EP08759792 A EP 08759792A EP 2150690 A1 EP2150690 A1 EP 2150690A1
Authority
EP
European Patent Office
Prior art keywords
stack
honeycomb body
zone
curvature
metal foils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08759792A
Other languages
German (de)
French (fr)
Other versions
EP2150690B1 (en
Inventor
Jörg-Roman KONIECZNY
Rolf BRÜCK
Jan Hodgson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Priority to PL08759792T priority Critical patent/PL2150690T3/en
Publication of EP2150690A1 publication Critical patent/EP2150690A1/en
Application granted granted Critical
Publication of EP2150690B1 publication Critical patent/EP2150690B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/525—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material which comprises flutes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/38—Honeycomb supports characterised by their structural details flow channels with means to enhance flow mixing,(e.g. protrusions or projections)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a honeycomb body, which is formed from a wound stack of partially structured sheet metal foils, wherein the stack has an electrical connection, so that there is a path for conducting an electric current through the honeycomb body to its heating.
  • a honeycomb body which is constructed of layers arranged at least partially structured sheets, which form a plurality of Maschinenschömbare for an exhaust gas channels, which extend from one end face to the other.
  • a plurality of planar gaps and / or electrically insulating layers extending in the direction from one end face to the other are positioned in such a way that at least one coherent electrically conductive current path running in a cross-sectional plane results.
  • the sheets are connected at one end to a first terminal contact and at its second end to the second terminal contact electrically conductive. In this way, it is possible in particular to realize a power supply and discharge substantially in one plane.
  • honeycomb body is known from WO 92/13635 Al, which can control the path of the electric current through the honeycomb body by a targeted local increase in the electrical resistance, that in corresponding areas of the sheet metal layers zones can be formed by the electric current be heated to an increased extent, so that an inhomogeneous heating of the honeycomb body is possible.
  • honeycomb bodies as heating catalysts has now shown that the current sometimes does not propagate uniformly along the individual sheet-metal foils of a stack, but with tortuous or spirally wound honeycomb bodies the shortest path between the electrical connection and the electrical ground examined.
  • the contact surfaces between structured and smooth sheets are used, through which the current, in particular in curvature areas of an outer sheet on the inner sheet skip and thus can seek the shortest current path. This results in different distributions of the current density over the cross section of the honeycomb body and thus also to an unwanted inhomogeneous heat distribution.
  • the object of the invention is therefore to solve the problems described with reference to the prior art, at least partially, and in particular to provide a honeycomb body which allows uniform heating over the entire cross section of the honeycomb body.
  • a honeycomb body is also to be specified, which has a longer service life due to a uniform current load despite more frequent use (for example in an exhaust system of a motor vehicle).
  • the honeycomb body according to the invention is formed with at least one tortuous stack of metal foils, wherein a first end of the stack is connected to an electrical connection and a second end with an electrical see ground, said at least one stack a plurality of each other in electrical Contact standing metal foils has, the metal foils are at least partially structured and determine a height of at least one stack in the direction of the structures, - the at least one stack at least one curvature with a small
  • Radius of curvature and a greater radius of curvature, and the at least one stack in a curvature portion comprising the at least one curvature forms at least one zone of increased electrical resistance extending over a portion of the height of the at least one stack, starting from the small radius of curvature ,
  • the stack of a plurality of sheet-metal foils which are in electrical contact with one another, may in particular be connected to an electrical connection which is arranged on a housing surrounding the honeycomb body, which housing may optionally have a plurality of segments over its circumference, thus accommodating each individual stack Power to put.
  • the mass may be arranged either on the circumference or also centrally in the middle of the cross section of the honeycomb body, wherein it should be connected to all layers.
  • the structures of the sheet metal foils are formed from corrugated shapes which extend parallel to the longitudinal axis or the flow direction of the honeycomb body, wherein the corrugated shapes are designed in particular in the form of omega or sine waves or zigzag-like (pointed).
  • a stack it is possible for a stack to be formed by a plurality of sheet-metal foils which lie flat against one another, so that the structures form a multiplicity of flow paths along their surface, for example for an exhaust gas.
  • the structures thus space the adjacent metal foils, so that the adjacent metal foils finally form a height of the entire stack, which depends in particular on the sum of the structure heights and the thicknesses of the metal foils.
  • a plurality of stacks form a honeycomb body, but here the use of a single stack (or a maximum of two stacks) is preferred for a simple construction, which fills the cross section of the honeycomb body by its meandering arrangement, for example.
  • the at least one zone of increased electrical resistance which is to be built up in particular in the inner region of a curvature in the inner sheet metal foils of a stack, serves to prevent the current from seeking the shortest possible path on the inside of the curvature and therefore to avoid it. preferably to be guided over the outer metal foils of the stack within the curved portion, so as to achieve an adapted current density and thus a uniform heating of the honeycomb body in the region of the curvature.
  • the procedure is such that, for example, the sheet-metal foils whose arrangement and / or electrical contact with each other in a predetermined curvature section is changed relative to other areas of the stack.
  • a zone of increased electrical resistance is formed over a portion of the "outer, larger” radius of curvature, so that the zone extends only over part of the height of the stack for example, no more than 60% of the height or even only 30% of the height. It is preferred that the proportion of the height over which
  • the at least one zone extends, depending on the configuration of the curvature (radius of curvature, curvature section length, ...) is selected, that is, for example, increases when a greater curvature is present.
  • the zone extends over a plurality of metal foils, so that it is formed only in the interaction of the electrical resistance and / or the electrical contact of the individual metal foils.
  • the at least one zone is formed with sheet-metal foils which have a minimum bending radius of less than 80 mm.
  • the zone is formed only then or only in the metal foils which have a minimum bending radius of less than 50 mm and particularly preferably less than 20 mm in the at least one zone in the region of the curved section.
  • the bending radius serves as a description of the course of curvature (the median plane or mean surface) of a single sheet metal foil. In the case that a structured sheet metal foil is considered, the curvature of the center plane is considered.
  • the bending radius of a sheet-metal foil can vary, so the minimum bending radius is used here, whereby the sheet-metal foil itself may be changed over the entire curvature section if its minimum bending radius falls below the above limit at only one point. or only for exactly the job area that has a bending radius smaller eg 80 mm has.
  • the at least one zone lies within an angle which starts from an origin of the radius of curvature.
  • the honeycomb body has at least one zone of increased resistances, the zone lying within an angle which starts from an origin of the (small) radius of curvature.
  • the resistors in the individual sheet-metal foils should be designed so that the electric current is not completely kept out of the at least one zone, but only to a lesser extent passes through the plates located in particular near the smallest radius of curvature.
  • this angle limits For example, the length of each metal foil on which the metal foil has increased electrical resistances to redirect an increased flow of current preferably flowed through areas in the smallest radius of curvature out to the outside arranged sheet metal foils of a stack.
  • the angle can be constant and have a range of 0 to 360 °, preferably a range of 90 to 180 ° and particularly preferably a range of 120 to 160 °.
  • the angle can also vary depending on the respective bending radius of the metal foils or the (smallest) radius of curvature of the curvature portion and is accordingly given as a function of the changing bending radius. In particular, the angle for sheet metal foils with a smaller bending radius is to be selected larger.
  • the sheet metal foils have zones of different length in the region of the at least one zone.
  • the zone in the direction of the height of the stack does not have to have a steady course, so here, for example, no rectangle, semicircular or cone-shaped zones must be formed.
  • each sheet metal foil which forms the at least one zone may (but need not) be modified over a predefinable range with respect to its flow behavior or contact behavior for electrical current, which may also be different from (all) adjacent sheet metal foils.
  • the resistances in the metal foils or the contact resistance of a plurality of metal foils can be increased within the at least one zone in different ways.
  • the sheet metal foils in the at least one zone differ in their thickness.
  • a thicker sheet metal foil has a lower electrical or ohmic resistance than a thinner sheet metal foil (with the same length and the same material).
  • the sheet metal Of course, they can be designed to be continuous in a respective thickness, in which case the metal foils in other areas of curvature can differ by further resistances, or the metal foils are each composed of materials of different thicknesses.
  • the metal foils are at least partially provided with a structure and at least a part of the metal foils in the at least one zone differ in their structures.
  • the structured sheet metal foils can differ with regard to the height of their structuring and also with respect to their shape.
  • sheets having sinusoidal or omega-shaped structures provide a comparatively larger contact area with adjacent (preferably smooth) sheet metal foils than zigzag-shaped sheet metal. These different contact surfaces lead to larger or smaller (contact) resistors with regard to the current transition from one metal foil to the other.
  • the sheet-metal foils have at least one element of the group of holes, slots, tabs and flow deflections.
  • the elements can be provided individually or cumulatively and can also be used with different predetermined dimensions.
  • in the sheet metal foils with a smaller bending radius of a stack may be provided to form the desired zone slots, which are arranged in particular transversely to the main flow direction of the electric current, so that the electric current forced here to longer ways and therefore preferred to avoid passing over adjacent layers is.
  • the size of a contact surface between individual adjacent sheet-metal foils is different within the at least one zone.
  • the contact surfaces between the adjacent surfaces can be interrupted in particular, for example by tabs, flow deflections, holes or slots, which in the extremes of the structured sheet metal foils or in the smooth foils in the Extrema of the structured films are arranged.
  • At least one metal foil has at least partially an insulating coating within the at least one zone.
  • This coating can be applied by way of example by flame spraying, diffusion or other methods to the otherwise electrically conductive sheet-metal foils and is therefore particularly suitable for influencing the contact resistance towards adjacent sheet-metal foils.
  • At least one sheet-metal foil comprises at least partially electrically non-conductive material within the at least one zone.
  • the current can be kept within the sheet-metal foil, without this being able to yield sheet-metal foils located further inside, in the direction of the smallest radius of curvature.
  • At least a part of the metal foils can be made within the at least one zone of different materials.
  • a specific resistance of the sheet metal foil in this zone can be adjusted.
  • the metal foils have a steel base material which has chromium and / or aluminum and / or nickel to a considerable extent.
  • the Composition of the metal foils, for example, by changing the surfaces, can therefore be designed differently in the zone of other areas of the metal foil.
  • the height of the at least one stack of the honeycomb body according to the invention is preferably at least 10 mm. In other embodiments, the height may also reach a value of at least 20 mm or even at least 50 mm. With these large stack heights, the effect of the "current flow abbreviation" occurs to a greater extent, so that especially in thick stacks without the here proposed zone of increased electrical resistance in the curvature section only small internal areas would be heated as a result of ohmic resistance heating Here with thick stacks a particularly large effect of the invention has been demonstrated.
  • the honeycomb body according to the invention is provided in particular for use in a motor vehicle. It then serves e.g. as a heating element for the exhaust gas flowing through it, a (catalytically active) at least partially provided on it coating and / or a downstream further exhaust gas treatment device.
  • FIGS. show, but are not limited to, particularly preferred embodiments of the invention. It shows schematically in:
  • FIG. 1 shows a cross section through a honeycomb body with S-shaped wound, partly insulated from each other, stacks of alternately smooth and corrugated metal foils, which define an S-shaped current path;
  • FIG. 2 shows a cross section of a further honeycomb body with an S-shaped wound stack
  • 3 shows a section of a first embodiment of a stack
  • honeycomb body 1 shows a honeycomb body 1 according to the invention as part of an exhaust device 32 of a motor vehicle 18, wherein the exhaust gas flow direction 31 extends parallel to the longitudinal axis 24 of the honeycomb body 1.
  • the honeycomb body 1 is constructed from two stacks 2, each consisting of smooth and structures 8 having sheet metal foils 7, which are arranged alternately, wherein the two stacks are 2 S-shaped entwined with each other.
  • the two intertwined stacks 2 are separated from one another by an insulation 19 and are located inside a housing 21.
  • the supply of the electrical current 22 takes place via an electrical connection 4, the removal of the current 22 occurs through an electrical ground 6.
  • the current flows 22 via the electrical terminal 4 and the power distribution structures 20, which surround the first end 3 of the first stack 2 like a beak, in the first stack 2 and passes through an S-shaped path to be received by power distribution structures 20, which is the second End beak 5 surround the first stack 2 also beak-like.
  • the current 22 is again fed via current distribution structures 20, which also beak-like surround the first end 3 of the second stack 2, into the second stack 2, and then flow back in opposite directions to the first S-shaped path through the second stack 2, at the second end 5 of the current 22 is in turn received by power distribution structures 20, which also surround the second end 5 of the second stack 2 like a beak.
  • the current 22 is then discharged to the outside via the feedthrough to the electrical ground 6 (the current flow is illustrated in principle by small arrows in FIG. 1).
  • a part of the power distribution structures 20 extends on the implementation opposite side of the housing 21 in the interior of a receptacle 33, wherein the power supply line 4 and the electrical ground 6 are separated in the interior of this cap by an insulation 19 as well as in the implementation.
  • An insulation 19 (gap or insulation material) also electrically separates subregions in the interior of the honeycomb body 1.
  • the electric current 22 in the embodiment of the honeycomb body 1 shown here would preferably be defined by the range of the smallest radii of curvature of the individual stacks 2, e.g. flow in the immediate vicinity of the origin 15 of a radius of curvature 11, so that in the region of the stack having the largest radii of curvature, no sufficient current density would be present, whereby a non-uniform heating of the honeycomb body 1 would be caused. Therefore, in particular in the region of the smallest radii of curvature zones 14 are provided, in which there is an increased electrical resistance, so that the electric current 22 is forced to increased flow through the outer metal foils 7 in the stack 2.
  • the described zones 14 of different resistors may, of course, also be arranged in a wide variety of embodiments along the longitudinal axis 24 of the honeycomb body 1 in addition to the preferred arrangement in areas of curvature of the stack 2, so that in addition to the uniform heating of the entire cross section 25 of the honeycomb body 1, a uniform and rapid heating along the longitudinal axis 24 of the honeycomb body 1 is achieved.
  • FIG. 2 likewise shows schematically a further exemplary embodiment of the honeycomb body 1 with a cross section 25, wherein only one stack 2 is shown here for better clarification of the function of the electrically heatable honeycomb body 1.
  • the stack 2 in this case extends from a, arranged on the housing 21, electrical connection 4 with a first end 3 via a curvature 10 comprehensive, curvature section 13 to the second end 5 of the stack 2, with the electrical ground 6, which also here in the housing 21 is tapped, is connected.
  • the stack 2 is constructed of smooth or structured Sheet metal foils 7, which are arranged one above the other in the direction of the expression of the structures 8, arranged at a height 9, the stack 2 in the region of the curvature portion 13 has a small radius of curvature 11 from an origin 15 and a large radius of curvature 12.
  • a zone 14 is provided, which is limited on the one hand by the small radius of curvature 11, starting from the origin 15, and only up to a certain proportion of the height 9 of the stack 2 extends and further lies within an angle 23.
  • FIG. 3 schematically shows a portion of a stack 2 having a height 9 and a zone 14 (which is delimited by the dashed line), which is formed from individual zone sections 26 of the sheet-metal foils 7.
  • the zone sections 26 are each of different lengths per sheet metal foil 7.
  • the zone portions 26 are here arranged within an angle 23 which spans from an origin 15 of a small radius of curvature 11 of the innermost sheet metal foil 7 of a stack.
  • the individual sheet-metal foils 7 can have different structures 8, so that thus preferred contact surfaces 29 are formed with corresponding contact resistances.
  • the individual sheet metal foils 7 of a stack 2 each have a bending radius 16, which can also change within the sheet metal foil 7 within the same curved section 13.
  • Fig. 4 shows schematically a section of a stack 2, wherein the sheet metal foils 7 partially wave-shaped structures 8 and additionally have holes 27, which may also be designed as elongated slots. Furthermore, the smooth Sheet metal foil 7 is provided in this example with an insulating coating 30 and has a thickness 17.
  • FIG. 5 shows schematically a further detail of a stack 2, wherein the sheet metal foils 7 partially have structures 8 and flow deflections 28.
  • the wave-shaped structures 8 are electrically connected via contact surfaces 29 with the smooth sheet metal foils 7.
  • the contact resistance between the metal foils 7 is increased here by means of missing contact surfaces 29 in the region of the flow deflections 28.
  • honeycomb bodies shown here only show a limited selection of embodiments with regard to the winding or the power supply or other details of the honeycomb body.

Abstract

An electrically heatable honeycomb body is formed with at least one wound stack of sheet-metal foils. A first end of the stack is connected to an electrical terminal and a second end is connected to an electrical ground. The stack has a plurality of sheet-metal foils which are in electrical contact with one another and which are at least partially structured and determine, in the direction of the structures, a height of the stack. The stack has at least one curvature with a small radius of curvature and a relatively large radius of curvature. A curvature section including the at least one curvature has at least one zone with increased electrical resistance starting from the small radius of curvature and extending over part of the height of the stack. A motor vehicle having at least one honeycomb body, is also provided.

Description

Elektrisch beheizbarer Wabenkörper mit Zonen erhöhter Widerstände Electrically heatable honeycomb body with zones of increased resistance
Die vorliegende Erfindung betrifft einen Wabenkörper, der aus einem gewundenen Stapel teilweise strukturierter Blechfolien gebildet ist, wobei der Stapel über einen elektrischen Anschluss verfügt, so dass ein Pfad zur Leitung eines elektrischen Stromes durch den Wabenkörper zu dessen Beheizung vorliegt.The present invention relates to a honeycomb body, which is formed from a wound stack of partially structured sheet metal foils, wherein the stack has an electrical connection, so that there is a path for conducting an electric current through the honeycomb body to its heating.
Die Entwicklung elektrisch beheizbarer metallischer Wabenkörper wurde in den letzten 20 Jahren maßgeblich von der Anmelderin vorangetrieben. So kann beispielsweise auf die WO 92/02714 Al verwiesen werden. Dort ist ein Wabenkörper beschrieben, der aus lagenweise angeordneten zumindest teilweise strukturierten Blechen aufgebaut ist, die eine Vielzahl von für ein Abgas durchströmbare Kanäle bilden, welche von der einen Stirnseite zur anderen verlaufen. Zudem sind mehrere, in Richtung von einer Stirnseite zur anderen, verlaufende flächige Spalte und/oder elektrisch isolierende Schichten so positioniert, dass sich zumindest ein zusammenhängender elektrisch leitfähiger und in einer Querschnittsebene verlaufender Strompfad ergibt. Die Bleche sind mit ihrem einen Ende an einem ersten Anschlusskontakt und an ihrem zweiten Ende an dem zweiten Anschlusskontakt elektrisch leitend angebunden. Auf diese Weise wird insbesondere ermöglicht, eine Stromzufuhr und Abfuhr im Wesentlichen in einer Ebene zu realisieren.The development of electrically heatable metallic honeycomb bodies has been largely driven by the applicant in the last 20 years. For example, reference may be made to WO 92/02714 A1. There, a honeycomb body is described, which is constructed of layers arranged at least partially structured sheets, which form a plurality of durchschömbare for an exhaust gas channels, which extend from one end face to the other. In addition, a plurality of planar gaps and / or electrically insulating layers extending in the direction from one end face to the other are positioned in such a way that at least one coherent electrically conductive current path running in a cross-sectional plane results. The sheets are connected at one end to a first terminal contact and at its second end to the second terminal contact electrically conductive. In this way, it is possible in particular to realize a power supply and discharge substantially in one plane.
Ein weiterer Wabenkörper ist aus der WO 92/13635 Al bekannt, der durch eine gezielte lokale Erhöhung des elektrischen Widerstandes den Pfad des elektrischen Stromes durch den Wabenkörper so steuern kann, dass in entsprechenden Bereichen der Blechlagen Zonen gebildet werden können, die durch den elektrischen Strom in erhöhtem Maße beheizt werden, so dass eine inhomogene Beheizung des Wabenkörpers möglich ist. Die langjährige Praxis im Gebrauch von Wabenkörpern als Heizkatalysatoren hat nun gezeigt, dass der Strom sich teilweise nicht gleichmäßig entlang der einzelnen Blechfolien eines Stapels ausbreitet, sondern sich bei gewundenen oder auch spiralförmig gewickelten Wabenkörpern den kürzesten Weg zwischen dem elekt- rischen Anschluss und der elektrischen Masse sucht. Dabei werden insbesondere die Kontaktflächen zwischen strukturierten und glatten Blechen genutzt, durch die der Strom insbesondere in Krümmungsbereichen von einem äußeren Blech auf das innere Blech überspringen und sich somit den kürzesten Strompfad suchen kann. Dadurch kommt es zu unterschiedlichen Verteilungen der Stromdichte über den Querschnitt des Wabenkörpers und somit auch zu einer ungewollten inhomogenen Wärmeverteilung.Another honeycomb body is known from WO 92/13635 Al, which can control the path of the electric current through the honeycomb body by a targeted local increase in the electrical resistance, that in corresponding areas of the sheet metal layers zones can be formed by the electric current be heated to an increased extent, so that an inhomogeneous heating of the honeycomb body is possible. The long-standing practice in the use of honeycomb bodies as heating catalysts has now shown that the current sometimes does not propagate uniformly along the individual sheet-metal foils of a stack, but with tortuous or spirally wound honeycomb bodies the shortest path between the electrical connection and the electrical ground examined. In particular, the contact surfaces between structured and smooth sheets are used, through which the current, in particular in curvature areas of an outer sheet on the inner sheet skip and thus can seek the shortest current path. This results in different distributions of the current density over the cross section of the honeycomb body and thus also to an unwanted inhomogeneous heat distribution.
Insbesondere bei großen Wabenkörpern, die in jüngerer Zeit verstärkt eingesetzt werden, kommt es infolge großer Stapelhöhen zu einer Verstärkung der un- gleichmäßigen Erwärmung bezogen auf den Querschnitt der Wabenkörper. Aufgrund der Größe ist hier auch der Effekt der Wärmekonvektion sehr viel geringer als bei kleiner gebauten Wabenkörper, so dass mit weniger elektrischem Strom beaufschlagte Bereiche des Wabenkörpers auch deutlich länger kühl bleiben.Particularly in the case of large honeycomb bodies, which have recently been used more intensively, as a result of large stack heights, there is an increase in the uneven heating relative to the cross section of the honeycomb bodies. Due to the size, the effect of heat convection is also much lower here than in the case of smaller honeycomb bodies, so that regions of the honeycomb body which are acted on with less electric current also remain cool for considerably longer.
Aufgabe der Erfindung ist es daher, die mit Bezug auf den Stand der Technik geschilderten Probleme zumindest teilweise zu lösen und insbesondere einen Wabenkörper bereitzustellen, der eine gleichmäßige Erwärmung über den gesamten Querschnitt des Wabenkörpers ermöglicht. Gleichzeitig soll auch ein Wabenköper angegeben werden, der aufgrund einer gleichmäßigen Strombelastung trotz häufi- geren Einsatzes (beispielsweise in einem Abgassystem eines Kraftfahrzeuges) eine längere Standzeit aufweist.The object of the invention is therefore to solve the problems described with reference to the prior art, at least partially, and in particular to provide a honeycomb body which allows uniform heating over the entire cross section of the honeycomb body. At the same time, a honeycomb body is also to be specified, which has a longer service life due to a uniform current load despite more frequent use (for example in an exhaust system of a motor vehicle).
Diese Aufgaben werden gelöst durch einen Wabenkörper gemäß den Merkmalen des Patentanspruchs 1. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängig formulierten Patentansprüchen angegeben. Es ist darauf hinzuweisen, dass die in den Unteransprüchen einzeln aufgeführten Merkmale in beliebi- ger, technologisch sinnvoller, Weise miteinander kombiniert werden können und weitere Ausgestaltungen der Erfindung definieren. Darüber hinaus werden die in den Patentansprüchen angegebenen Merkmale in der Beschreibung näher präzisiert und erläutert, wobei weitere bevorzugte Ausführungsbeispiele der Erfindung dargestellt werden.These objects are achieved by a honeycomb body according to the features of claim 1. Further advantageous embodiments of the invention are specified in the dependent formulated claims. It should be noted that the features listed individually in the subclaims ger, technologically more meaningful, can be combined with each other and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.
Zur Lösung dieser Aufgabe ist der erfindungsgemäße Wabenkörper mit wenigstens einem gewundenen Stapel Blechfolien gebildet, wobei ein erstes Ende des Stapels mit einem elektrischen Anschluss und ein zweites Ende mit einer elektri- sehen Masse verbunden ist, wobei der wenigstens eine Stapel eine Mehrzahl von miteinander in elektrischem Kontakt stehenden Blechfolien hat, die Blechfolien zumindest teilweise strukturiert sind und in Richtung der Strukturen eine Höhe des wenigstens einen Stapels bestimmen, - der wenigstens eine Stapel wenigstens eine Krümmung mit einem kleinenTo solve this problem, the honeycomb body according to the invention is formed with at least one tortuous stack of metal foils, wherein a first end of the stack is connected to an electrical connection and a second end with an electrical see ground, said at least one stack a plurality of each other in electrical Contact standing metal foils has, the metal foils are at least partially structured and determine a height of at least one stack in the direction of the structures, - the at least one stack at least one curvature with a small
Krümmungsradius und einem größeren Krümmungsradius hat und der wenigstens eine Stapel in einem Krümmungsabschnitt, welcher die wenigstens eine Krümmung umfasst, zumindest eine Zone erhöhten elektrischen Widerstands bildet, die sich, ausgehend vom kleinen Krümmungs- radius, über einen Teil der Höhe des wenigstens einen Stapels erstreckt.Radius of curvature and a greater radius of curvature, and the at least one stack in a curvature portion comprising the at least one curvature forms at least one zone of increased electrical resistance extending over a portion of the height of the at least one stack, starting from the small radius of curvature ,
Der hier genannte Stapel von einer Mehrzahl miteinander in elektrischem Kontakt stehenden Blechfolien kann insbesondere mit einem elektrischen Anschluss verbunden sein, der auf einem den Wabenkörper umgebenden Gehäuse angeordnet ist, wobei dieses Gehäuse gegebenenfalls über seinen Umfang mehrere Segmente aufweisen kann, um somit jeden einzelnen Stapel unter Strom zu setzen. Weiterhin kann die Masse entweder auf dem Umfang oder auch zentral in der Mitte des Querschnittes des Wabenkörpers angeordnet sein, wobei sie mit allen Lagen verbunden sein sollte. Die beiden eingangs genannten Veröffentlichungen der An- melderin können insbesondere auch zur Veranschaulichung und näheren Beschreibung der Stromzufuhr herangezogen werden. Bevorzugt sind die Strukturen der Blechfolien gebildet aus Wellformen, die sich parallel zu der Längsachse bzw. der Durchströmungsrichtung des Wabenkörpers erstrecken, wobei die Wellformen insbesondere in Form von Omega- oder Sinuswellen bzw. Zickzack-artig (spitz) gestaltet sind. Grundsätzlich ist möglich, dass ein Stapel durch mehrere Blechfolien gebildet ist, die flächig aneinander anliegen, so dass die Strukturen eine Vielzahl von Strömungswegen entlang ihrer Oberfläche beispielsweise für ein Abgas bilden. Die Strukturen beabstanden somit die benachbarten Blechfolien, so dass die aneinander liegenden Blechfolien schließlich eine Höhe des gesamten Stapels bilden, die insbesondere von der Summe der Strukturhöhen und den Dicken der Blechfolien abhängt. Grundsätzlich ist möglich, dass mehrere Stapel einen Wabenkörper bilden, hier ist jedoch für einen einfachen Aufbau der Einsatz eines einzelnen Stapels (oder maximal 2 Stapel) bevorzugt, der den Querschnitt des Wabenkörpers durch seine z.B. mäanderförmige Anordnung ausfüllt.The stack of a plurality of sheet-metal foils, which are in electrical contact with one another, may in particular be connected to an electrical connection which is arranged on a housing surrounding the honeycomb body, which housing may optionally have a plurality of segments over its circumference, thus accommodating each individual stack Power to put. Furthermore, the mass may be arranged either on the circumference or also centrally in the middle of the cross section of the honeycomb body, wherein it should be connected to all layers. The two publications cited by the applicant can be used in particular for the purpose of illustrating and describing the power supply in more detail. Preferably, the structures of the sheet metal foils are formed from corrugated shapes which extend parallel to the longitudinal axis or the flow direction of the honeycomb body, wherein the corrugated shapes are designed in particular in the form of omega or sine waves or zigzag-like (pointed). In principle, it is possible for a stack to be formed by a plurality of sheet-metal foils which lie flat against one another, so that the structures form a multiplicity of flow paths along their surface, for example for an exhaust gas. The structures thus space the adjacent metal foils, so that the adjacent metal foils finally form a height of the entire stack, which depends in particular on the sum of the structure heights and the thicknesses of the metal foils. In principle, it is possible that a plurality of stacks form a honeycomb body, but here the use of a single stack (or a maximum of two stacks) is preferred for a simple construction, which fills the cross section of the honeycomb body by its meandering arrangement, for example.
Die zumindest eine Zone erhöhten elektrischen Widerstandes, die insbesondere im inneren Bereich einer Krümmung in den inneren Blechfolien eines Stapels aufgebaut werden soll, dient dazu den Strom davon abzuhalten sich den kürzestmögli- chen Pfad auf der Innenseite der Krümmung entlang zu suchen und ihn daher be- vorzugt über die äußeren Blechfolien des Stapels innerhalb des Krümmungsabschnittes zu leiten, um somit eine angepasste Stromdichte und damit eine gleichmäßige Erwärmung des Wabenkörpers auch im Bereich der Krümmung zu erreichen. Hierfür wird nun insbesondere so vorgegangen, dass beispielsweise die Blechfolien, deren Anordnung und/oder elektrischer Kontakt zueinander in einem vorgegebenen Krümmungsabschnitt gegenüber anderen Bereichen des Stapels verändert ist. In diesem Krümmungsabschnitt wird mit anderen Worten nämlich nahe des „inneren, kleineren" Krümmungsradius eine Zone mit einem erhöhten elektrischen Widerstand gegenüber einem Bereich des „äußeren, größeren" Krümmungsradius gebildet, so dass sich die Zone demnach nur über einen Teil der Höhe des Stapels erstreckt, zum Beispiel höchstens 60 % der Höhe oder sogar nur 30 % der Höhe. Bevorzugt ist dabei, dass der Anteil der Höhe, über die sichThe at least one zone of increased electrical resistance, which is to be built up in particular in the inner region of a curvature in the inner sheet metal foils of a stack, serves to prevent the current from seeking the shortest possible path on the inside of the curvature and therefore to avoid it. preferably to be guided over the outer metal foils of the stack within the curved portion, so as to achieve an adapted current density and thus a uniform heating of the honeycomb body in the region of the curvature. For this purpose, in particular, the procedure is such that, for example, the sheet-metal foils whose arrangement and / or electrical contact with each other in a predetermined curvature section is changed relative to other areas of the stack. In other words, in this curvature section, near the "inner, smaller" radius of curvature, a zone of increased electrical resistance is formed over a portion of the "outer, larger" radius of curvature, so that the zone extends only over part of the height of the stack for example, no more than 60% of the height or even only 30% of the height. It is preferred that the proportion of the height over which
- A - die mindestens eine Zone erstreckt, in Abhängigkeit von der Ausgestaltung der Krümmung (Krümmungsradius, Krümmungsabschnittslänge,...) gewählt ist, also z.B. zunimmt, wenn eine stärkere Krümmung vorliegt. Die Zone erstreckt sich dabei über mehrere Blechfolien hinweg, so dass diese erst in der Zusammenwir- kung des elektrischen Widerstandes und/oder des elektrischen Kontaktes der einzelnen Blechfolien ausgebildet ist.- A - the at least one zone extends, depending on the configuration of the curvature (radius of curvature, curvature section length, ...) is selected, that is, for example, increases when a greater curvature is present. In this case, the zone extends over a plurality of metal foils, so that it is formed only in the interaction of the electrical resistance and / or the electrical contact of the individual metal foils.
Gemäß einer Weiterbildung der Erfindung wird vorgeschlagen, dass die zumindest eine Zone mit Blechfolien gebildet ist, die einen minimalen Biegeradius klei- ner 80 mm aufweisen. Bevorzugt wird die Zone sogar erst dann bzw. nur bei den Blechfolien ausgebildet, die im Bereich des Krümmungsabschnitt einen minimalen Biegeradius kleiner 50 mm und besonders bevorzugt kleiner 20 mm in der zumindest einen Zone aufweisen. Der Biegeradius dient als Beschreibung des Krümmungsverlaufes (der Mittelebene bzw. mittlere Fläche) einer einzelnen Blechfolie. Für den Fall, dass eine strukturierte Blechfolie betrachtet wird, wird der Krümmungsverlauf der Mittelebene betrachtet. Innerhalb des Krümmungsab- schnitts kann der Biegeradius einer Blechfolie variieren, deshalb wird hier auf den minimalen Biegeradius abgestellt, wobei ggf. die Blechfolie selbst über den gesamten Krümmungsabschnitt verändert sein kann, wenn ihr minimaler Biegeradi- us nur an einer Stelle den vorstehenden Grenzwert unterschreitet, oder nur für genau den Stellenbereich, der einen Biegeradius kleiner z.B. 80 mm hat.According to one embodiment of the invention, it is proposed that the at least one zone is formed with sheet-metal foils which have a minimum bending radius of less than 80 mm. Preferably, the zone is formed only then or only in the metal foils which have a minimum bending radius of less than 50 mm and particularly preferably less than 20 mm in the at least one zone in the region of the curved section. The bending radius serves as a description of the course of curvature (the median plane or mean surface) of a single sheet metal foil. In the case that a structured sheet metal foil is considered, the curvature of the center plane is considered. Within the curvature section, the bending radius of a sheet-metal foil can vary, so the minimum bending radius is used here, whereby the sheet-metal foil itself may be changed over the entire curvature section if its minimum bending radius falls below the above limit at only one point. or only for exactly the job area that has a bending radius smaller eg 80 mm has.
Gemäß einer weiteren erfindungsgemäßen Ausgestaltung liegt die zumindest eine Zone innerhalb eines Winkels, der von einem Ursprung des Krümmungsradius ausgeht. Mit anderen Worten weist der Wabenkörper also insbesondere zumindest eine Zone erhöhter Widerstände auf, wobei die Zone innerhalb eines Winkels liegt, der von einem Ursprung des (kleinen) Krümmungsradius ausgeht. Die Widerstände in den einzelnen Blechfolien sollten so ausgeführt sein, dass der elektrische Strom nicht vollständig aus der mindestens einen Zone herausgehalten wird, sondern nur in geringerem Maße die insbesondere nahe dem kleinsten Krümmungsradius liegenden Bleche durchläuft. Daher begrenzt dieser Winkel bei- spielsweise die Länge einer jeden Blechfolie, auf der die Blechfolie erhöhte elektrische Widerstände aufweist, um einen verstärkten Stromfluss aus bevorzugt durchströmten Bereichen in die vom kleinsten Krümmungsradius hin zu außen angeordneten Blechfolien eines Stapels umzuleiten. Der Winkel kann dabei kon- stant sein und einen Bereich von 0 bis 360° aufweisen, bevorzugt einen Bereich von 90 bis 180° und besonders bevorzugt einen Bereich von 120 bis 160°. Der Winkel kann auch abhängig von dem jeweiligen Biegeradius der Blechfolien bzw. dem (kleinsten) Krümmungsradius des Krümmungsabschnitts variieren und ist dementsprechend als Funktion des sich ändernden Biegeradius angebbar. Insbe- sondere ist der Winkel für Blechfolien mit kleinerem Biegeradius größer zu wählen.According to a further embodiment of the invention, the at least one zone lies within an angle which starts from an origin of the radius of curvature. In other words, in particular, the honeycomb body has at least one zone of increased resistances, the zone lying within an angle which starts from an origin of the (small) radius of curvature. The resistors in the individual sheet-metal foils should be designed so that the electric current is not completely kept out of the at least one zone, but only to a lesser extent passes through the plates located in particular near the smallest radius of curvature. Therefore, this angle limits For example, the length of each metal foil on which the metal foil has increased electrical resistances to redirect an increased flow of current preferably flowed through areas in the smallest radius of curvature out to the outside arranged sheet metal foils of a stack. The angle can be constant and have a range of 0 to 360 °, preferably a range of 90 to 180 ° and particularly preferably a range of 120 to 160 °. The angle can also vary depending on the respective bending radius of the metal foils or the (smallest) radius of curvature of the curvature portion and is accordingly given as a function of the changing bending radius. In particular, the angle for sheet metal foils with a smaller bending radius is to be selected larger.
Gemäß einer weiteren Ausbildung des Wabenkörpers weist zumindest ein Teil der Blechfolien im Bereich der zumindest einen Zone verschieden lange Zonenab- schnitte auf. Damit ist insbesondere gemeint, dass die Zone in Richtung der Höhe des Stapels keinen stetigen Verlauf haben muss, hier also beispielsweise keine Rechteck-, Halbkreis- oder Konusförmigen Zonen ausgebildet sein müssen. Vielmehr kann (muss aber nicht) jede Blechfolie, die die mindestens eine Zone mit ausbildet, über einen vorgebbaren Bereich hinsichtlich ihres Durchströmverhal- tens bzw. Kontaktverhaltens für elektrischen Strom abgewandelt sein, der ggf. auch verschieden von (allen) benachbarten Blechfolien ist.According to a further embodiment of the honeycomb body, at least some of the sheet metal foils have zones of different length in the region of the at least one zone. This means in particular that the zone in the direction of the height of the stack does not have to have a steady course, so here, for example, no rectangle, semicircular or cone-shaped zones must be formed. Rather, each sheet metal foil which forms the at least one zone may (but need not) be modified over a predefinable range with respect to its flow behavior or contact behavior for electrical current, which may also be different from (all) adjacent sheet metal foils.
Grundsätzlich können die Widerstände in den Blechfolien bzw. der Kontaktwiderstand mehrerer Blechfolien miteinander innerhalb der wenigstens einen Zone auf unterschiedlichste Art und Weise erhöht werden.In principle, the resistances in the metal foils or the contact resistance of a plurality of metal foils can be increased within the at least one zone in different ways.
Gemäß einer zweckmäßigen Ausführungsform des erfmdungsgemäßen Wabenkörpers unterscheiden sich zumindest ein Teil der Blechfolien in der zumindest einen Zone in ihrer Dicke. Grundsätzlich ist davon auszugehen, dass eine dickere Blechfolie einen geringeren elektrischen bzw. ohmschen Widerstand aufweist als eine dünnere Blechfolie (bei gleicher Länge und gleichem Material). Die Blechfo- lien können natürlich dabei durchgängig in einer jeweiligen Dicke ausgeführt sein, wobei sich dann die Blechfolien in anderen Krümmungsbereichen durch weitere Widerstände unterscheiden können, oder die Blechfolien sind jeweils aus unterschiedlich dicken Materialien zusammengesetzt.According to an expedient embodiment of the honeycomb body according to the invention, at least part of the sheet metal foils in the at least one zone differ in their thickness. Basically, it can be assumed that a thicker sheet metal foil has a lower electrical or ohmic resistance than a thinner sheet metal foil (with the same length and the same material). The sheet metal Of course, they can be designed to be continuous in a respective thickness, in which case the metal foils in other areas of curvature can differ by further resistances, or the metal foils are each composed of materials of different thicknesses.
Gemäß einer weiteren Ausführungsform ist vorgesehen, dass die Blechfolien zumindest teilweise mit einer Struktur versehen sind und sich zumindest ein Teil der Blechfolien in der zumindest einen Zone in ihren Strukturen unterscheiden. Dabei ist insbesondere gemeint, dass einerseits die strukturierten Blechfolien sich hin- sichtlich der Höhe ihrer Strukturierung unterscheiden können als auch hinsichtlich ihrer Form. Zum Beispiel bieten Bleche, die Sinus- oder Omega-förmige Strukturen aufweisen, eine vergleichsweise größere Kontaktfläche zu benachbarten (vorzugsweise glatten) Blechfolien als Zickzack- förmig (spitz) strukturierte Bleche. Diese unterschiedlichen Kontaktflächen führen zu größeren bzw. kleineren (Kon- takt-)Widerständen hinsichtlich des Stromübergangs von einer Blechfolie zur anderen.According to a further embodiment, it is provided that the metal foils are at least partially provided with a structure and at least a part of the metal foils in the at least one zone differ in their structures. In particular, it is meant that, on the one hand, the structured sheet metal foils can differ with regard to the height of their structuring and also with respect to their shape. For example, sheets having sinusoidal or omega-shaped structures provide a comparatively larger contact area with adjacent (preferably smooth) sheet metal foils than zigzag-shaped sheet metal. These different contact surfaces lead to larger or smaller (contact) resistors with regard to the current transition from one metal foil to the other.
Gemäß einer weiteren Ausführungsform ist vorgesehen, dass zumindest ein Teil der Blechfolien wenigstens ein Element der Gruppe Löcher, Schlitze, Laschen und Strömungsumlenkungen aufweisen. Die Elemente können einzeln oder kumulativ vorgesehen sein und auch mit unterschiedlich vorgegebener Dimension verwendet werden. Insbesondere in den Blechfolien mit kleinerem Biegeradius eines Stapels können zur Ausbildung der gewünschten Zone Schlitze vorgesehen sein, die insbesondere quer zur Hauptdurchflussrichtung des elektrischen Stroms ange- ordnet sind, so dass der elektrische Strom hier zu längeren Wegen gezwungen und daher ein Ausweichen über benachbarte Lagen bevorzugt ist. Während Löcher und/oder Schlitze sich nur in der Ebene der Blechfolie erstrecken, treten Laschen und/oder Strömungsumlenkungen aus der Blechfolienebene hervor und können somit zusätzlich zur elektrischen Kontaktierung benachbarter Blechfolien und/oder zur Beeinflussung des Strömungsverhaltens eines Fluides (insbesondere Abgas) durch den Wabenköper bzw. dessen Kanäle genutzt werden. Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung ist innerhalb der zumindest einen Zone die Größe einer Kontaktfläche zwischen einzelnen benachbarten Blechfolien unterschiedlich. In Ergänzung zu dem bereits angeführten Merkmal sei hier angemerkt, dass die Kontaktflächen zwischen den benachbarten Oberflächen insbesondere auch unterbrochen sein können, z.B. durch Laschen, Strömungsumlenkungen, Löcher oder Schlitze, die in den Extrema der strukturierten Blechfolien oder auch in den glatten Folien im Bereich der Extrema der strukturierten Folien angeordnet sind.According to a further embodiment, it is provided that at least part of the sheet-metal foils have at least one element of the group of holes, slots, tabs and flow deflections. The elements can be provided individually or cumulatively and can also be used with different predetermined dimensions. In particular, in the sheet metal foils with a smaller bending radius of a stack may be provided to form the desired zone slots, which are arranged in particular transversely to the main flow direction of the electric current, so that the electric current forced here to longer ways and therefore preferred to avoid passing over adjacent layers is. While holes and / or slots extend only in the plane of the sheet metal foil, tabs and / or flow deflections emerge from the sheet metal foil layer and thus can additionally affect the electrical contacting of adjacent sheet metal foils and / or influencing the flow behavior of a fluid (in particular exhaust gas) through the honeycomb body or whose channels are used. According to a further preferred embodiment of the invention, the size of a contact surface between individual adjacent sheet-metal foils is different within the at least one zone. In addition to the already mentioned feature, it should be noted here that the contact surfaces between the adjacent surfaces can be interrupted in particular, for example by tabs, flow deflections, holes or slots, which in the extremes of the structured sheet metal foils or in the smooth foils in the Extrema of the structured films are arranged.
Gemäß einer weiteren vorteilhaften Ausführungsform ist vorgesehen, dass wenigstens eine Blechfolie innerhalb der zumindest einen Zone wenigstens teilweise eine isolierende Beschichtung aufweist. Diese Beschichtung kann beispielhaft durch Flammspritzen, Diffusion oder andere Verfahren auf die ansonsten elekt- risch leitfähigen Blechfolien aufgebracht werden und ist somit insbesondere zur Beeinflussung des Kontaktwiderstandes hin zu benachbarten Blechfolien geeignet.According to a further advantageous embodiment, it is provided that at least one metal foil has at least partially an insulating coating within the at least one zone. This coating can be applied by way of example by flame spraying, diffusion or other methods to the otherwise electrically conductive sheet-metal foils and is therefore particularly suitable for influencing the contact resistance towards adjacent sheet-metal foils.
Ebenfalls vorteilhaft ist es, wenn wenigstens eine Blechfolie innerhalb der zumin- dest einen Zone wenigstens teilweise elektrisch nichtleitendes Material umfasst. Somit kann bei Blechfolien, die innerhalb eines Stapels im Bereich des größten Krümmungsradius angeordnet sind, der Strom innerhalb der Blechfolie gehalten werden, ohne dass dieser aufweiter innen, in Richtung des kleinsten Krümmungsradius, gelegene Blechfolien ausweichen kann.It is also advantageous if at least one sheet-metal foil comprises at least partially electrically non-conductive material within the at least one zone. Thus, in the case of sheet-metal foils which are arranged within a stack in the region of the greatest radius of curvature, the current can be kept within the sheet-metal foil, without this being able to yield sheet-metal foils located further inside, in the direction of the smallest radius of curvature.
Gemäß einer weiteren vorteilhaften Ausführungsform kann zumindest ein Teil der Blechfolien innerhalb der zumindest einen Zone aus unterschiedlichen Materialien hergestellt sein. Durch die abgestimmte Auswahl geeigneter Materialien kann ein spezifischer Widerstand der Blechfolie in dieser Zone eingestellt werden. Bevor- zugt ist, dass die Blechfolien einen Stahl-Grundwerkstoff aufweisen, der Chrom und/oder Aluminium und/oder Nickel in erheblichem Umfang aufweist. Die Zu- sammensetzung der Blechfolien, z.B. auch durch Veränderung der Oberflächen, kann demnach im Bereich der Zone von anderen Bereichen der Blechfolie verschieden ausgeführt sein.According to a further advantageous embodiment, at least a part of the metal foils can be made within the at least one zone of different materials. Through the coordinated selection of suitable materials, a specific resistance of the sheet metal foil in this zone can be adjusted. It is preferred that the metal foils have a steel base material which has chromium and / or aluminum and / or nickel to a considerable extent. The Composition of the metal foils, for example, by changing the surfaces, can therefore be designed differently in the zone of other areas of the metal foil.
Die Höhe des wenigstens einen Stapels des erfindungsgemäßen Wabenkörpers beträgt bevorzugt wenigstens 10 mm. In anderen Ausführungsformen kann die Höhe auch einen Wert von wenigstens 20 mm oder sogar mindestens 50 mm erreichen. Bei diesen großen Stapelhöhen tritt der Effekt der „Stromfluss- Abkürzung" in verstärktem Maße auf, so dass gerade bei dicken Stapeln ohne die hier vorgeschlagene Zone eines erhöhten elektrischen Widerstandes im Krümmungsabschnitt nur kleine innere Bereiche in Folge der ohmschen Widerstandserwärmung erwärmt werden würden. Damit ist hier bei dicken Stapeln eine besonders große Wirkung der Erfindung nachgewiesen worden.The height of the at least one stack of the honeycomb body according to the invention is preferably at least 10 mm. In other embodiments, the height may also reach a value of at least 20 mm or even at least 50 mm. With these large stack heights, the effect of the "current flow abbreviation" occurs to a greater extent, so that especially in thick stacks without the here proposed zone of increased electrical resistance in the curvature section only small internal areas would be heated as a result of ohmic resistance heating Here with thick stacks a particularly large effect of the invention has been demonstrated.
Dabei ist der erfindungsgemäße Wabenkörper insbesondere vorgesehen für den Einsatz in einem Kraftfahrzeug. Er dient dann z.B. als Heizelement für das ihn durchströmende Abgas, eine auf ihm zumindest teilweise vorgesehene (katalytisch aktive) Beschichtung und/oder einer nachgeordneten weiteren Abgasbehandlungseinrichtung .In this case, the honeycomb body according to the invention is provided in particular for use in a motor vehicle. It then serves e.g. as a heating element for the exhaust gas flowing through it, a (catalytically active) at least partially provided on it coating and / or a downstream further exhaust gas treatment device.
Die Erfindung sowie das technische Umfeld werden nachfolgend anhand der Figuren näher erläutert. Es ist darauf hinzuweisen, dass die Figuren besonders bevorzugte Ausführungsvarianten der Erfindung zeigen, auf die sie jedoch nicht beschränkt sind. Es zeigen darin schematisch:The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the figures show, but are not limited to, particularly preferred embodiments of the invention. It shows schematically in:
Fig. 1 : einen Querschnitt durch einen Wabenkörper mit S-förmig gewundenen, zum Teil voneinander isolierten, Stapeln von abwechselnd glatten und gewellten Blechfolien, welche einen S-förmigen Strompfad festlegen;1 shows a cross section through a honeycomb body with S-shaped wound, partly insulated from each other, stacks of alternately smooth and corrugated metal foils, which define an S-shaped current path;
Fig. 2: einen Querschnitt eines weiteren Wabenkörpers mit einem S-förmig gewundenen Stapel; Fig. 3: einen Abschnitt einer ersten Ausfuhrungsvariante eines Stapels;2 shows a cross section of a further honeycomb body with an S-shaped wound stack; 3 shows a section of a first embodiment of a stack;
Fig. 4: einen Ausschnitt einer zweiten Ausfuhrungsvariante eines Stapels; und4 shows a detail of a second embodiment of a stack; and
Fig. 5: einen Ausschnitt einer dritten Ausführungsvariante eines Stapels.5: a detail of a third embodiment of a stack.
Fig. 1 zeigt einen erfindungsgemäßen Wabenkörper 1 als Bestandteil einer Abgasvorrichtung 32 eines Kraftfahrzeuges 18, wobei die Abgasströmungsrichtung 31 parallel zu der Längsachse 24 des Wabenkörpers 1 verläuft. Der Wabenkörper 1 ist dabei aus zwei Stapeln 2 aufgebaut, die jeweils aus glatten und Strukturen 8 aufweisenden Blechfolien 7 bestehen, welche abwechselnd aufeinander angeordnet sind, wobei die beiden Stapel 2 S-förmig miteinander verschlungen sind. Die beiden verschlungenen Stapel 2 sind durch eine Isolation 19 voneinander getrennt und befinden sich im Inneren eines Gehäuses 21. Die Zufuhr des elektrischen Stroms 22 geschieht über einen elektrischen Anschluss 4, die Abfuhr des Stroms 22 geschieht durch eine elektrische Masse 6. Zunächst fließt der Strom 22 über den elektrischen Anschluss 4 und die Stromverteilungsstrukturen 20, die das erste Ende 3 des ersten Stapels 2 schnabelartig umschließen, in den ersten Stapel 2 hin- ein und durchläuft einen S-förmigen Pfad, um von Stromverteilungsstrukturen 20 aufgenommen zu werden, welche das zweite Ende 5 des ersten Stapels 2 ebenfalls schnabelartig umschließen. Von hieraus wird der Strom 22 erneut über Stromverteilungsstrukturen 20, welche das erste Ende 3 des zweiten Stapels 2 ebenfalls schnabelartig umschließen, in den zweiten Stapel 2 eingespeist, um daraufhin ge- genläufig zu dem ersten S-förmigen Pfad durch den zweiten Stapel 2 zurückzufließen, an dessen zweitem Ende 5 der Strom 22 wiederum durch Stromverteilungsstrukturen 20 aufgenommen wird, welche auch das zweite Ende 5 des zweiten Stapels 2 schnabelartig umschließen. Von hier aus wird der Strom 22 dann über die Durchführung hin zur elektrischen Masse 6 nach außen abgeleitet (der Stromfiuss ist prinzipiell mit kleinen Pfeilen in Fig. 1 veranschaulicht). Ein Teil der Stromverteilungsstrukturen 20 erstreckt sich auf der der Durchführung gege- nüberliegenden Seite des Gehäuses 21 in das Innere einer Aufnahme 33, wobei die Stromzuleitung 4 und die elektrische Masse 6 im Inneren dieser Kappe durch eine Isolation 19 ebenso voneinander getrennt sind wie in der Durchführung. Eine Isolation 19 (Spalt oder Isolationsmaterial) trennt auch im Inneren des Wabenkör- pers 1 Teilbereiche elektrisch voneinander.1 shows a honeycomb body 1 according to the invention as part of an exhaust device 32 of a motor vehicle 18, wherein the exhaust gas flow direction 31 extends parallel to the longitudinal axis 24 of the honeycomb body 1. The honeycomb body 1 is constructed from two stacks 2, each consisting of smooth and structures 8 having sheet metal foils 7, which are arranged alternately, wherein the two stacks are 2 S-shaped entwined with each other. The two intertwined stacks 2 are separated from one another by an insulation 19 and are located inside a housing 21. The supply of the electrical current 22 takes place via an electrical connection 4, the removal of the current 22 occurs through an electrical ground 6. First, the current flows 22 via the electrical terminal 4 and the power distribution structures 20, which surround the first end 3 of the first stack 2 like a beak, in the first stack 2 and passes through an S-shaped path to be received by power distribution structures 20, which is the second End beak 5 surround the first stack 2 also beak-like. From here, the current 22 is again fed via current distribution structures 20, which also beak-like surround the first end 3 of the second stack 2, into the second stack 2, and then flow back in opposite directions to the first S-shaped path through the second stack 2, at the second end 5 of the current 22 is in turn received by power distribution structures 20, which also surround the second end 5 of the second stack 2 like a beak. From here, the current 22 is then discharged to the outside via the feedthrough to the electrical ground 6 (the current flow is illustrated in principle by small arrows in FIG. 1). A part of the power distribution structures 20 extends on the implementation opposite side of the housing 21 in the interior of a receptacle 33, wherein the power supply line 4 and the electrical ground 6 are separated in the interior of this cap by an insulation 19 as well as in the implementation. An insulation 19 (gap or insulation material) also electrically separates subregions in the interior of the honeycomb body 1.
Der elektrische Strom 22 würde in der hier gezeigten Ausführungsform des Wabenkörpers 1 bevorzugt durch den Bereich der kleinsten Krümmungsradien der einzelnen Stapel 2, z.B. in unmittelbarer Nähe des Ursprungs 15 eines Krüm- mungsradius 11 fließen, so dass in dem Bereich des Stapels, der die größten Krümmungsradien aufweist, keine ausreichende Stromdichte vorhanden wäre, wodurch eine ungleichmäßige Erwärmung des Wabenkörpers 1 hervorgerufen werden würde. Daher sind insbesondere im Bereich der kleinsten Krümmungsradien Zonen 14 vorgesehen, in denen ein erhöhter elektrischer Widerstand vorliegt, so dass der elektrische Strom 22 zur verstärkten Durchströmung der äußeren Blechfolien 7 in dem Stapel 2 gezwungen wird. Die beschriebenen Zonen 14 unterschiedlicher Widerstände können neben der bevorzugten Anordnung in Krümmungsbereichen der Stapel 2 natürlich auch in unterschiedlichster Ausführung entlang der Längsachse 24 des Wabenkörpers 1 angeordnet sein, so dass neben der gleichmäßigen Erwärmung des gesamten Querschnitts 25 des Wabenkörpers 1 auch eine gleichmäßige und schnelle Erwärmung entlang der Längsachse 24 des Wabenkörpers 1 erreicht wird.The electric current 22 in the embodiment of the honeycomb body 1 shown here would preferably be defined by the range of the smallest radii of curvature of the individual stacks 2, e.g. flow in the immediate vicinity of the origin 15 of a radius of curvature 11, so that in the region of the stack having the largest radii of curvature, no sufficient current density would be present, whereby a non-uniform heating of the honeycomb body 1 would be caused. Therefore, in particular in the region of the smallest radii of curvature zones 14 are provided, in which there is an increased electrical resistance, so that the electric current 22 is forced to increased flow through the outer metal foils 7 in the stack 2. The described zones 14 of different resistors may, of course, also be arranged in a wide variety of embodiments along the longitudinal axis 24 of the honeycomb body 1 in addition to the preferred arrangement in areas of curvature of the stack 2, so that in addition to the uniform heating of the entire cross section 25 of the honeycomb body 1, a uniform and rapid heating along the longitudinal axis 24 of the honeycomb body 1 is achieved.
Fig. 2 zeigt ebenfalls schematisch ein weiteres Ausführungsbeispiel des Waben- körpers 1 mit einem Querschnitt 25, wobei hier nur ein Stapel 2 zur besseren Verdeutlichung der Funktion des elektrisch beheizbaren Wabenkörpers 1 dargestellt ist. Der Stapel 2 erstreckt sich hierbei von einem, am Gehäuse 21 angeordneten, elektrischen Anschluss 4 mit einem ersten Ende 3 über einen, eine Krümmung 10 umfassenden, Krümmungsabschnitt 13 zu dem zweiten Ende 5 des Stapels 2, der mit der elektrischen Masse 6, welche ebenfalls hier im Gehäuse 21 abgegriffen wird, verbunden ist. Der Stapel 2 ist aufgebaut aus glatten bzw. strukturierten Blechfolien 7, die aufeinander angeordnet in Richtung der Ausprägung der Strukturen 8, zu einer Höhe 9 angeordnet sind, wobei der Stapel 2 im Bereich des Krümmungsabschnitts 13 einen kleinen Krümmungsradius 11 ausgehend von einem Ursprung 15 und einen großen Krümmungsradius 12 aufweist. Innerhalb des Krümmungsabschnitts 13 ist eine Zone 14 vorgesehen, die einerseits begrenzt wird von dem kleinen Krümmungsradius 11, ausgehend von dem Ursprung 15, und nur bis zu einem bestimmten Anteil der Höhe 9 des Stapels 2 reicht und weiterhin innerhalb eines Winkels 23 liegt.FIG. 2 likewise shows schematically a further exemplary embodiment of the honeycomb body 1 with a cross section 25, wherein only one stack 2 is shown here for better clarification of the function of the electrically heatable honeycomb body 1. The stack 2 in this case extends from a, arranged on the housing 21, electrical connection 4 with a first end 3 via a curvature 10 comprehensive, curvature section 13 to the second end 5 of the stack 2, with the electrical ground 6, which also here in the housing 21 is tapped, is connected. The stack 2 is constructed of smooth or structured Sheet metal foils 7, which are arranged one above the other in the direction of the expression of the structures 8, arranged at a height 9, the stack 2 in the region of the curvature portion 13 has a small radius of curvature 11 from an origin 15 and a large radius of curvature 12. Within the curvature section 13, a zone 14 is provided, which is limited on the one hand by the small radius of curvature 11, starting from the origin 15, and only up to a certain proportion of the height 9 of the stack 2 extends and further lies within an angle 23.
Innerhalb dieser Zone 14 sind mit den Blechfolien 7 zusammen elektrische Widerstände derart gebildet, dass der Strom 22 insbesondere nicht über den denkbar kürzesten Weg entlang des kleinen Krümmungsradius 11 fließt, sondern vielmehr durch die Zone 14 in die äußeren Blechfolien 7 in der Nähe des großen Krümmungsradius 12 so abgeleitet wird, dass es zu einer angepassten Stromdichte und damit gleichmäßigen Erhitzung des gesamten Stapelquerschnitts kommt.Within this zone 14, electrical resistances are formed together with the metal foils 7 in such a way that the current 22 in particular does not flow over the conceivably shortest path along the small radius of curvature 11, but rather through the zone 14 into the outer metal foils 7 in the vicinity of the large radius of curvature 12 is derived so that it comes to an adjusted current density and thus uniform heating of the entire stack cross-section.
Fig. 3 zeigt schematisch einen Abschnitt eines Stapels 2 mit einer Höhe 9 und einer Zone 14 (die von der gestrichelten Linie begrenzt wird), die aus einzelnen Zonenabschnitten 26 der Blechfolien 7 ausgebildet ist. Dabei sind die Zonenab- schnitte 26 je Blechfolie 7 unterschiedlich lang. Die Zonenabschnitte 26 sind hier innerhalb eines Winkels 23 angeordnet, der sich von einem Ursprung 15 eines kleinen Krümmungsradius 11 der innersten Blechfolie 7 eines Stapels aufspannt. Die einzelnen Blechfolien 7 können unterschiedliche Strukturen 8 aufweisen, damit so bevorzugte Kontaktflächen 29 mit entsprechenden Übergangswiderständen gebildet werden. Die einzelnen Blechfolien 7 eines Stapels 2 weisen jeweils einen Biegeradius 16 auf, der sich entlang der Blechfolie 7 auch innerhalb desselben Krümmungsabschnitts 13 verändern kann.FIG. 3 schematically shows a portion of a stack 2 having a height 9 and a zone 14 (which is delimited by the dashed line), which is formed from individual zone sections 26 of the sheet-metal foils 7. In this case, the zone sections 26 are each of different lengths per sheet metal foil 7. The zone portions 26 are here arranged within an angle 23 which spans from an origin 15 of a small radius of curvature 11 of the innermost sheet metal foil 7 of a stack. The individual sheet-metal foils 7 can have different structures 8, so that thus preferred contact surfaces 29 are formed with corresponding contact resistances. The individual sheet metal foils 7 of a stack 2 each have a bending radius 16, which can also change within the sheet metal foil 7 within the same curved section 13.
Fig. 4 zeigt schematisch einen Ausschnitt eines Stapels 2, wobei die Blechfolien 7 teilweise wellenförmige Strukturen 8 aufweisen und zusätzlich Löcher 27, die auch als langgestreckte Schlitze ausgeführt sein können. Weiterhin ist die glatte Blechfolie 7 in diesem Beispiel mit einer isolierenden Beschichtung 30 versehen und weist eine Dicke 17 auf.Fig. 4 shows schematically a section of a stack 2, wherein the sheet metal foils 7 partially wave-shaped structures 8 and additionally have holes 27, which may also be designed as elongated slots. Furthermore, the smooth Sheet metal foil 7 is provided in this example with an insulating coating 30 and has a thickness 17.
Fig. 5 zeigt schematisch einen weiteren Ausschnitt eines Stapels 2, wobei die Blechfolien 7 teilweise Strukturen 8 aufweisen sowie Strömungsumlenkungen 28. Die wellenförmigen Strukturen 8 sind über Kontaktflächen 29 elektrisch leitend mit den glatten Blechfolien 7 verbunden. Der Übergangswiderstand zwischen den Blechfolien 7 wird hier über fehlende Kontaktflächen 29 im Bereich der Strömungsumlenkungen 28 erhöht.5 shows schematically a further detail of a stack 2, wherein the sheet metal foils 7 partially have structures 8 and flow deflections 28. The wave-shaped structures 8 are electrically connected via contact surfaces 29 with the smooth sheet metal foils 7. The contact resistance between the metal foils 7 is increased here by means of missing contact surfaces 29 in the region of the flow deflections 28.
Die hier gezeigten unterschiedlichen Ausführungsformen von Wabenkörpern zeigen nur eine begrenzte Auswahl von Ausführungsformen hinsichtlich der Windung oder der Stromversorgung oder sonstiger Details des Wabenkörpers. The various embodiments of honeycomb bodies shown here only show a limited selection of embodiments with regard to the winding or the power supply or other details of the honeycomb body.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Wabenkörper1 honeycomb body
2 Stapel2 stacks
3 erstes Ende3 first end
4 elektrischer Anschluss4 electrical connection
5 zweites Ende5 second end
6 elektrische Masse6 electrical ground
7 Blechfolie7 sheet metal foil
8 Strukturen8 structures
9 Höhe9 height
10 Krümmung10 curvature
11 kleiner Krümmungsradius11 small radius of curvature
12 großer Krümmungsradius12 large radius of curvature
13 Krümmungsabschnitt13 curvature section
14 Zone14 zone
15 Ursprung15 origin
16 Biegeradius16 bending radius
17 Dicke17 thickness
18 Kraftfahrzeug18 motor vehicle
19 Isolation19 isolation
20 Stromverteilungsstrukturen20 power distribution structures
21 Gehäuse21 housing
22 Strom22 electricity
23 Winkel23 angles
24 Längsachse24 longitudinal axis
25 Querschnitt25 cross section
26 Zonenabschnitte26 zone sections
27 Löcher27 holes
28 Strömungsumlenkungen28 flow deflections
29 Kontaktfläche isolierende Beschichtung Abgasströmungsrichtung Abgasvorrichtung Aufnahme 29 contact surface insulating coating exhaust gas flow direction exhaust device intake

Claims

Patentansprüche claims
1. Wabenkörper (1), der mit wenigstens einem gewundenen Stapel (2) Blechfo- lien (7) gebildet ist, wobei ein erstes Ende (3) des Stapels (2) mit einem elektrischen Anschluss (4) und ein zweites Ende (5) mit einer elektrischen Masse (6) verbunden ist, wobeiA honeycomb body (1) which is formed with at least one wound stack (2) Blechfo- lien (7), wherein a first end (3) of the stack (2) with an electrical connection (4) and a second end (5 ) is connected to an electrical ground (6), wherein
- der wenigstens eine Stapel (2) eine Mehrzahl von miteinander in elektrischem Kontakt stehenden Blechfolien (7) hat, - die Blechfolien (7) zumindest teilweise strukturiert sind und in Richtung der Strukturen (8) eine Höhe (9) des wenigstens einen Stapels (2) bestimmen,- The at least one stack (2) has a plurality of mutually in electrical contact sheet metal foils (7), - The sheet metal foils (7) are at least partially structured and in the direction of the structures (8) has a height (9) of the at least one stack ( 2) determine
- der wenigstens eine Stapel (2) wenigstens eine Krümmung (10) mit einem kleinen Krümmungsradius (11) und einem großen Krümmungsradius (12) hat und- The at least one stack (2) has at least one curvature (10) with a small radius of curvature (11) and a large radius of curvature (12) and
- der wenigstens eine Stapel (2) in einem Krümmungsabschnitt (13), welcher die wenigstens eine Krümmung (10) umfasst, zumindest eine Zone (14) erhöhten elektrischen Widerstandes bildet, die sich, ausgehend vom kleinen Krümmungsradius (11), über einen Teil der Höhe (9) des wenigs- tens einen Stapels (2) erstreckt.- The at least one stack (2) in a curved portion (13) which comprises the at least one curvature (10), at least one zone (14) of increased electrical resistance forms, starting from the small radius of curvature (11), over a part the height (9) of the at least one stack (2) extends.
2. Wabenkörper (1) nach Patentanspruch 1, wobei die zumindest eine Zone (14) mit Blechfolien (7) gebildet ist, die einen minimalen Biegeradius (16) kleiner 80 mm in der zumindest einen Zone (14) aufweisen.2. honeycomb body (1) according to claim 1, wherein the at least one zone (14) with sheet metal foils (7) is formed, which have a minimum bending radius (16) smaller than 80 mm in the at least one zone (14).
3. Wabenkörper (1) nach Patentanspruch 1 oder 2, wobei die zumindest eine Zone (14) innerhalb eines Winkels (23) liegt, der von einem Ursprung (15) des Krümmungsradius (11) ausgeht. 3. honeycomb body (1) according to claim 1 or 2, wherein the at least one zone (14) within an angle (23), which extends from an origin (15) of the radius of curvature (11).
4. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei zumindest ein Teil der Blechfolien (7) im Bereich der zumindest einen Zone (14) verschieden lange Zonenabschnitte (26) aufweist.4. honeycomb body (1) according to one of the preceding claims, wherein at least a portion of the sheet metal foils (7) in the region of at least one zone (14) of different length zone sections (26).
5. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei sich zumindest ein Teil der Blechfolien (7) in der zumindest einen Zone (14) in ihrer Dicke (17) unterscheiden.5. honeycomb body (1) according to one of the preceding claims, wherein at least a part of the sheet metal foils (7) in the at least one zone (14) differ in their thickness (17).
6. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei die Blechfolien (7) zumindest teilweise mit einer Struktur (8) versehen und sich zumindest ein Teil der Blechfolien (7) in der zumindest einen Zone (14) in ihren Strukturen (8) unterscheiden.6. honeycomb body (1) according to any one of the preceding claims, wherein the sheet metal foils (7) at least partially provided with a structure (8) and at least a portion of the sheet metal foils (7) in the at least one zone (14) in their structures (8 ).
7. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei zumindest ein Teil der Blechfolien (7) wenigstens ein Element der Gruppe7. honeycomb body (1) according to any one of the preceding claims, wherein at least a portion of the sheet metal foils (7) at least one element of the group
Löcher (27), Schlitze, Laschen und Strömungsumlenkungen (28) aufweisen.Holes (27), slots, tabs and flow deflections (28).
8. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei innerhalb der zumindest einen Zone (14) die Größe einer Kontaktfläche (29) zwischen einzelnen benachbarten Blechfolien (7) unterschiedlich ist.8. honeycomb body (1) according to any one of the preceding claims, wherein within the at least one zone (14), the size of a contact surface (29) between each adjacent metal foils (7) is different.
9. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei wenigstens eine Blechfolie (7) innerhalb der zumindest einen Zone (14) wenigstens teilweise eine isolierende Beschichtung (30) aufweist.9. honeycomb body (1) according to one of the preceding claims, wherein at least one metal foil (7) within the at least one zone (14) at least partially an insulating coating (30).
10. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei wenigstens eine Blechfolie (7) innerhalb der zumindest einen Zone (14) wenigstens teilweise elektrisch nichtleitendes Material umfasst. 10. honeycomb body (1) according to any one of the preceding claims, wherein at least one metal foil (7) within the at least one zone (14) at least partially electrically non-conductive material.
11. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei wenigstens ein Teil der Blechfolien (7) innerhalb der zumindest einen Zone (14) aus unterschiedlichen Materialien sind.11. honeycomb body (1) according to any one of the preceding claims, wherein at least a portion of the sheet metal foils (7) within the at least one zone (14) made of different materials.
12. Wabenkörper (1) nach einem der vorhergehenden Patentansprüche, wobei die Höhe (9) des wenigstens einen Stapels (2) wenigstens 10 mm beträgt.12. honeycomb body (1) according to one of the preceding claims, wherein the height (9) of the at least one stack (2) is at least 10 mm.
13. Kraftfahrzeug (18), aufweisend wenigstens einen Wabenkörper (1) nach einem der vorhergehenden Patentansprüche. 13. Motor vehicle (18), comprising at least one honeycomb body (1) according to one of the preceding claims.
EP08759792A 2007-05-31 2008-05-20 Electrically heatable honey-comb structure having zones of increased resistance Active EP2150690B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08759792T PL2150690T3 (en) 2007-05-31 2008-05-20 Electrically heatable honey-comb structure having zones of increased resistance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007025418A DE102007025418A1 (en) 2007-05-31 2007-05-31 Electrically heatable honeycomb body with zones of increased resistance
PCT/EP2008/056180 WO2008145567A1 (en) 2007-05-31 2008-05-20 Electrically heatable honey-comb structure having zones of increased resistance

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EP2150690A1 true EP2150690A1 (en) 2010-02-10
EP2150690B1 EP2150690B1 (en) 2012-02-22

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US (1) US8288688B2 (en)
EP (1) EP2150690B1 (en)
JP (1) JP2010528221A (en)
KR (1) KR101234916B1 (en)
CN (1) CN101680340B (en)
AT (1) ATE546621T1 (en)
DE (1) DE102007025418A1 (en)
ES (1) ES2382619T3 (en)
PL (1) PL2150690T3 (en)
RU (1) RU2469198C2 (en)
TW (1) TWI434991B (en)
WO (1) WO2008145567A1 (en)

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JP6173349B2 (en) * 2012-01-13 2017-08-02 エミテック ゲゼルシヤフト フユア エミツシオンステクノロギー ミツト ベシユレンクテル ハフツング An electrically heatable honeycomb body with multiple sheet metal layers electrically connected to connecting pins
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CN108661762B (en) * 2018-05-09 2021-04-09 单利 Metal carrier capable of being used for electric heating and manufacturing method thereof
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Also Published As

Publication number Publication date
RU2469198C2 (en) 2012-12-10
CN101680340A (en) 2010-03-24
ES2382619T3 (en) 2012-06-11
WO2008145567A1 (en) 2008-12-04
US8288688B2 (en) 2012-10-16
EP2150690B1 (en) 2012-02-22
KR20100017943A (en) 2010-02-16
CN101680340B (en) 2013-01-23
PL2150690T3 (en) 2012-07-31
KR101234916B1 (en) 2013-02-19
JP2010528221A (en) 2010-08-19
ATE546621T1 (en) 2012-03-15
TWI434991B (en) 2014-04-21
TW200902841A (en) 2009-01-16
RU2009148885A (en) 2011-07-27
US20100108657A1 (en) 2010-05-06
DE102007025418A1 (en) 2008-12-04

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